I started as a concubine, and I made the crown prince cry with my delicious food.

Xiao Jingshi held the letter in his hand, his fingertips clearly feeling the thickness of the paper.

He looked down and saw that there was no salutation on the envelope, only the two words "Peace" written in neat handwriting.

Simple, yet incredibly heavy.

"A method to prevent the plague?" He raised his eyes to look at Ye An'an, his gaze filled with inquiry and confusion. "Where did you learn that?"

In his view, plagues were natural disasters. Since ancient times, once they broke out, corpses littered the fields, and human strength could hardly resist them. Although some prescriptions were recorded in medical books, most of them had little effect, and it was mostly up to fate.

As for Ye An'an, a general's daughter raised in seclusion, even if she read some books after entering the palace, how could she know these "methods" that even the Imperial Hospital was helpless against?

"I...I saw it in an old book before." Ye An'an had already prepared her explanation. Her eyes darted around for a moment, and she said vaguely, "It was a very old travelogue, which recorded some strange and unusual things. It mentioned that a similar epidemic had broken out in a certain place in the south, and how the locals dealt with it. I found it interesting at the time, so I wrote it down."

This explanation, though somewhat far-fetched, is the only one available at the moment.

We can't exactly tell him that this knowledge comes from a 21st-century public health and epidemic prevention system that has been scientifically verified countless times, can we?

Seeing her obviously guilty expression, Xiao Jingshi didn't press her further.

He knew that this woman had many secrets.

Just like her endless stream of culinary recipes, he couldn't find out their origins, so he simply stopped asking.

All he knew was that she wouldn't hurt him.

"Okay, I will read it." He solemnly put the letter into his bosom, close to his chest.

Ye An'an breathed a sigh of relief when she saw him put it away.

What she wrote might seem unbelievable to people of this era, and might even be considered nonsense.

But she had to write.

Because she knew that in ancient times, what was truly deadly was often not the flood itself, but the large-scale epidemics caused by poor sanitation and water pollution after the disaster, such as cholera and typhoid fever.

In her letter, she wrote down several core guidelines for epidemic prevention in the simplest and most straightforward language.

First, water source safety. She emphasized that all drinking water must be boiled before consumption, and raw water must never be drunk. Wells contaminated by floods must be disinfected with lime.

Second, environmental sanitation. She suggested organizing manpower to promptly clean up the silt, garbage, and animal carcasses left behind after the flood recedes, and to centrally incinerate or bury them deeply. At disaster relief sites, simple public toilets should be built, and urination and defecation indiscriminately should be prohibited; excrement should also be covered and disinfected with lime.

Third, patient isolation. Once a patient is found to have symptoms such as fever, vomiting, or diarrhea, they must be immediately isolated and cared for by designated personnel to prevent cross-infection. Those caring for the patient must cover their mouth and nose with a cloth and wash their hands with soap or strong alcohol after contact with the patient.

Fourth, personal protection. She drew a simple diagram of a face mask and advised all personnel entering the disaster area, especially soldiers and medical workers, to wear masks. At the same time, she emphasized the importance of frequent handwashing and maintaining good personal hygiene.

These things, which seem like common sense in modern times, are revolutionary concepts in this era.

Ye An'an wrote in great detail, afraid that they wouldn't understand. She meticulously considered every step and every detail, describing them in the simplest language possible.

When she wrote this letter, her expression was more focused and serious than ever before.

At that moment, she was no longer the little cook who only knew how to eat, drink, have fun, and joke around, but a time traveler who carried the knowledge of modern civilization and wanted to do her part in this era.

Looking at her serious expression, Xiao Jingshi suddenly realized that the weight of this letter was far greater than he had imagined.

He didn't know what was written inside, but he trusted her.

"It's getting late, you should get some rest." Xiao Jingshi looked at the faint dark circles under her eyes and knew that she must not have rested well these past few days while preparing her luggage for him, so his voice softened unconsciously.

"Mm." Ye An'an nodded.

Everything that needed to be prepared has been prepared, and everything that needed to be explained has been explained. The rest is up to fate.

"Your Highness, you..." She opened her mouth, wanting to say "Take care on your journey" and "Come back soon," but the words felt a little pretentious.

In the end, she simply raised her head, looked earnestly into his eyes, and said, "Your Highness, you must eat what I make on time and you are not allowed to give it to anyone else."

Her tone carried a hint of possessiveness and domineering assertiveness.

Xiao Jingshi was stunned for a moment, and then, his heart, which had become heavy with the thought of his upcoming journey, seemed to be gently soothed by a soft hand.

He looked at her, his eyes overflowing with tenderness.

He didn't speak, but simply reached out and gently tucked a stray strand of hair behind her ear.

His fingertips were icy cold, yet trembled almost imperceptibly.

A gentle touch, and they're gone in an instant.

But it made both of their hearts skip a beat.

"it is good."

He responded softly, his voice carrying a hint of doting affection that he himself was unaware of.

"I promise, I'll be the only one eating this."

Apart from the two small jars of smoked meat given to Xie Zhao and Lu Chengyuan.

He silently added a sentence in his mind.